参数资料
型号: MC68EC060RC50
厂商: Freescale Semiconductor
文件页数: 94/128页
文件大小: 0K
描述: IC MPU 32BIT 50MHZ 206-PGA
标准包装: 10
系列: M680x0
处理器类型: M680x0 32-位
速度: 50MHz
电压: 3.3V
安装类型: 通孔
封装/外壳: 206-BEPGA
供应商设备封装: 206-PGA(47.25x47.25)
包装: 托盘
Integer Unit
3-4
M68060 USER’S MANUAL
MOTOROLA
The supervisor programming model consists of the registers available to the user as well as
the following control registers:
32-Bit Supervisor Stack Pointer (SSP, A7)
16-Bit Status Register (SR)
32-Bit Vector Base Register (VBR)
Two 32-Bit Alternate Function Code Registers: Source Function Code (SFC) and Des-
tination Function Code (DFC)
32-Bit Processor Configuration Register (PCR)
The following paragraphs describe the supervisor programming model registers. Additional
information on the SSP, SR, and VBR registers can be found in Section 8 Exception Pro-
cessing.
3.2.2.1 SUPERVISOR STACK POINTER. When the MC68060 is operating at the supervi-
sor level, instructions that use the system stack implicitly, or access address register A7
explicitly, use the SSP. The SSP is a general-purpose register and can be used as a soft-
ware stack pointer, index register, or base address register. The SSP can be used for word
and long-word operations. The initial value of the SSP is loaded from the reset exception
vector, address offset 0.
3.2.2.2 STATUS REGISTER. The SR (see Figure 3-4) stores the processor status and
includes the CCR, the interrupt priority mask, and other control bits. In the supervisor mode,
software can access the entire SR. The control bits indicate the following states for the pro-
cessor: trace mode (T-bit), supervisor or user mode (S-bit), and master or interrupt state (M).
3.2.2.3 VECTOR BASE REGISTER. The VBR contains the base address of the exception
vector table in memory. The displacement of an exception vector is added to the value in
this register to access the vector table. Refer to Section 8 Exception Processing for infor-
mation on exception vectors.
Figure 3-4. Status Register
T0
S
M
0
I2
I1
I0
X
N
Z
V
C
00
0
SYSTEM BYTE
USER BYTE
(CONDITION CODE REGISTER)
TRACE ENABLE
INTERRUPT
PRIORITY MASK
SUPERVISOR/USER STATE
MASTER/INTERRUPT STATE
EXTEND
NEGATIVE
ZERO
OVERFLOW
CARRY
15
14
13
12
11
10
9
8
7
5
6
43210
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